Numbers 20:8

5 And wherefore have ye made us to come up out of Egypt, to bring us in unto this evil place? it is no place of seed, or of figs, or of vines, or of pomegranates; neither is there any water to drink.

6 And Moses and Aaron went from the presence of the assembly unto the door of the tent of meeting, and fell upon their faces: and the glory of Jehovah appeared unto them.

7 And Jehovah spake unto Moses, saying,

8 Take the rod, and assemble the congregation, thou, and Aaron thy brother, and speak ye unto the rock before their eyes, that it give forth its water; and thou shalt bring forth to them water out of the rock; so thou shalt give the congregation and their cattle drink.

9 And Moses took the rod from before Jehovah, as he commanded him.

10 And Moses and Aaron gathered the assembly together before the rock, and he said unto them, Hear now, ye rebels; shall we bring you forth water out of this rock?

11 And Moses lifted up his hand, and smote the rock with his rod twice: and water came forth abundantly, and the congregation drank, and their cattle.